Multiple hasmany same keycolumn - illegal access to loading collection - nhibernate

Question

it works. pull the data, but gives this error: illegal access to loading collection
public class Image : File
{
public virtual string ImagePath { get; set; }
}
public class Video : File
{
public virtual string VideoPath { get; set; }
public virtual string VideoType { get; set; }
}
public class Service : ContentBase
{
public virtual IList<Image> Images { get; set; }
public virtual IList<Video> Videos { get; set; }
}
public class ServiceMap:SubclassMap<Domain.Service>
{
public ServiceMap()
{
DiscriminatorValue("Service");
HasMany(x => x.Images).KeyColumn("ContentBase");
HasMany(x => x.Videos).KeyColumn("ContentBase");
}
}
public class ImageMap:SubclassMap<Image>
{
public ImageMap()
{
DiscriminatorValue("Image");
Map(x => x.ImagePath);
}
}
public class VideoMap:SubclassMap<Video>
{
public VideoMap()
{
DiscriminatorValue("Video");
Map(x => x.VideoPath);
}
}
it works. but it gives this error when I query. I think the same "keycolumn" gives this error to be. mapping'i How should I do?

Answer 1

Are you aware that joinalias wont eagerload the collections? that's what Fetch is for. Try this one instead
var service = UnitOfWork.CurrentSession.QueryOver<Service>()
.Fetch(x => x.Images).Eager
.Fetch(x => x.Videos).Eager
.Where(x => x.Id == serviceId)
.SingleOrDefault();
Update:
illegal access to loading collection could be thrown when
session is closed when accessing not initialized collection
mapping and collection type mismatch
Database doesn't match
have you inspected the sql generated to see if NH tries to access nonexistant columns or columns on the wrong table?